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Yes, come is a preposition in such phrases as come July, come evening, come dinnertime...

You can hear thus usage in the Jimmy Buffett song "Come Monday" (YouTube video & lyrics).

In felicitous uses, come ________ can be paraphrased by

by the time _________ arrives or, by the time it is _________, or when ________ gets here.

All the example sentences in Oxford can be paraphrased by using the expressions above.

It makes no sense in your sentence

*I was preparing pizza dough for the come evening.

just as no prepositional phrase would make sense there.

You could say the coming evening.

You could say something like

I was preparing pizza dough so we could cook pizzas come evening.

Yes, come is a preposition in such phrases as come July, come evening, come dinnertime...

In felicitous uses, come ________ can be paraphrased by

by the time _________ arrives or by the time it is _________.

All the example sentences in Oxford can be paraphrased by using the expressions above.

It makes no sense in your sentence

*I was preparing pizza dough for the come evening.

just as no prepositional phrase would make sense there.

You could say the coming evening.

You could say something like

I was preparing pizza dough so we could cook pizzas come evening.

Yes, come is a preposition in such phrases as come July, come evening, come dinnertime...

You can hear thus usage in the Jimmy Buffett song "Come Monday" (YouTube video & lyrics).

In felicitous uses, come ________ can be paraphrased by

by the time _________ arrives, by the time it is _________, or when ________ gets here.

All the example sentences in Oxford can be paraphrased by using the expressions above.

It makes no sense in your sentence

*I was preparing pizza dough for the come evening.

just as no prepositional phrase would make sense there.

You could say the coming evening.

You could say something like

I was preparing pizza dough so we could cook pizzas come evening.

2 deleted 24 characters in body
source | link

Yes, come is a preposition in such phrases as come July, come evening, come dinnertime...

In felicitous uses, come ________ can be paraphrased by

by the time _________ arrives or by the time it is _________ (or just by ________).

All the example sentences in Oxford can be paraphrased by using the expressions above.

It makes no sense in your sentence

*I was preparing pizza dough for the come evening.

just as no prepositional phrase would make sense there.

You could say the coming evening.

You could say something like

I was preparing pizza dough so we could cook pizzas come evening.

Yes, come is a preposition in such phrases as come July, come evening, come dinnertime...

In felicitous uses, come ________ can be paraphrased by

by the time _________ arrives or by the time it is _________ (or just by ________).

All the example sentences in Oxford can be paraphrased by using the expressions above.

It makes no sense in your sentence

*I was preparing pizza dough for the come evening.

just as no prepositional phrase would make sense there.

You could say the coming evening.

You could say something like

I was preparing pizza dough so we could cook pizzas come evening.

Yes, come is a preposition in such phrases as come July, come evening, come dinnertime...

In felicitous uses, come ________ can be paraphrased by

by the time _________ arrives or by the time it is _________.

All the example sentences in Oxford can be paraphrased by using the expressions above.

It makes no sense in your sentence

*I was preparing pizza dough for the come evening.

just as no prepositional phrase would make sense there.

You could say the coming evening.

You could say something like

I was preparing pizza dough so we could cook pizzas come evening.

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source | link

Yes, come is a preposition in such phrases as come July, come evening, come dinnertime...

In felicitous uses, come ________ can be paraphrased by

by the time _________ arrives or by the time it is _________ (or just by ________).

All the example sentences in Oxford can be paraphrased by using the expressions above.

It makes no sense in your sentence

*I was preparing pizza dough for the come evening.

just as no prepositional phrase would make sense there.

You could say the coming evening.

You could say something like

I was preparing pizza dough so we could cook pizzas come evening.